84 Lumber Company

AK Steel Holding Corporation

American Colloid Co.

Ameriwood Industries International Corp.

Apasco S.A. de C.V.

Asbury Carbons, Inc.

Bairnco Corporation

Blessings Corp.

Bodycote International PLC

Brush Engineered Materials Inc.

California Steel Industries, Inc.

Callanan Industries, Inc.

Cameron & Barkley Company

Carborundum Company

Carl-Zeiss-Stiftung

Carlisle Companies Inc.

Carter Holt Harvey Ltd.

Cemex SA de CV

Century Aluminum Company

CertainTeed Corporation

Chargeurs International

Chemfab Corporation

Cimentos de Portugal SGPS S.A. (Cimpor)

Cold Spring Granite Company Inc.

Columbia Forest Products Inc.

Compagnie de Saint-Gobain S.A.

Cookson Group plc

Dal-Tile International Inc.

Dyckerhoff AG

Dynamic Materials Corporation

Dyson Group PLC

Edw. C. Levy Co.

ElkCorp

Empire Resources, Inc.

English China Clays Ltd.

English China Clays plc

Envirodyne Industries, Inc.

Fibreboard Corporation

Florida Rock Industries, Inc.

Foamex International Inc.

Formica Corporation

GAF Corporation

Giant Cement Holding, Inc.

Gibraltar Steel Corporation

Granite Rock Company

Groupe Sidel S.A.

Harbison-Walker Refractories Company

Heidelberger Zement AG

Hexcel Corporation

Holnam Inc.

Holt and Bugbee Company

Homasote Company

Howmet Corp.

Huttig Building Products, Inc.

Ibstock Brick Ltd.

Imerys S.A.

Imperial Industries, Inc.

Internacional de Ceramica, S.A. de C.V.

International Shipbreaking Ltd. L.L.C.

Joseph T. Ryerson & Son, Inc.

Lafarge Corporation

Lehigh Portland Cement Company

Material Sciences Corporation

McJunkin Corporation

Medusa Corporation

Nevamar Company

North Pacific Group, Inc.

OmniSource Corporation

Otor S.A.

Pilkington plc

Rinker Group Ltd.

Rock of Ages Corporation

Rogers Corporation

Royal Group Technologies Limited

SIG plc

Schuff Steel Company

Sekisui Chemical Co., Ltd.

Severstal Joint Stock Company

Shaw Industries

Simplex Technologies Inc.

Siskin Steel & Supply Company

Solutia Inc.

Sommer-Allibert S.A.

Southdown, Inc.

Spartech Corporation

Ssangyong Cement Industrial Co., Ltd.

Steel Technologies Inc.

Sun Distributors L.P.

Symyx Technologies, Inc.

TOTO LTD.

Tarmac plc

The David J. Joseph Company

The Dexter Corporation

The Geon Company

The Rugby Group plc

The Sherwin-Williams Company

The Siam Cement Public Company Limited

Tilcon-Connecticut Inc.

Tuscarora Inc.

U.S. Aggregates, Inc.

USG Corporation

United States Steel Corporation

Usinas Siderúrgicas de Minas Gerais S.A.

Vicat S.A.

Wacker-Chemie GmbH

Waxman Industries, Inc.

Weber et Broutin France

Wienerberger AG

Wolseley plc

Zoltek Companies, Inc.

voestalpine AG

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